react-countdown-hook

A React hook that gets a date object and returns a countdown to that date.

Install

npm i @kfiros/react-countdown-hook

Features

• Format the countdown however you want
• Get an object that includes all the data of the countdown
• Run a function when the countdown ends
• Uses date-fns

Props

Name	Description	Type	Default	Example
finishTime	The time that we should count to	Date	required	example
format	The format of the formatted string	String	''	example
onFinish	A function that runs when the count finishes	function	() => {}	example

Examples

Getting formatted countdown string

You can get a formatted countdown string in a given format.
Only characters inside curly brackets will be formatted, if you want to add regular English - do it outside of the curly brackets.

Examples of valid formats

• {hh:mm:ss}
• {y} years, {M} months, {d} days, {h} hours, {m} minutes, {d} days

Format patterns

Unit	Pattern	Result examples
Second	s	0, 6, 9, 42
	ss	00, 06, 09, 42
Minute	m	0, 6, 9, 42
	mm	00, 06, 09, 42
Hour	h	0, 6, 9, 42
	hh	00, 06, 09, 42
Day	d	0, 6, 9, 42
	dd	00, 06, 09, 42
Month	M	0, 6, 9, 42
	MM	00, 06, 09, 42
Year	y	0, 6, 9, 42
	yy	00, 06, 09, 42

Example usage

import React from 'react';
import { useCountdown } from '@kfiros/react-countdown-hook';

const App() {
  const { formattedText } = useCountdown({
    finishTime: new Date(2022, 2, 11),
    format: "{hh:mm:ss}"
  });

  return (
    <span>{formattedText}</span>
  );
}

export default { App };

Getting an object

You can also get a date-fns duration object that includes all the data of the countdown.

Example usage

import React from 'react';
import { useCountdown } from '@kfiros/react-countdown-hook';

const App() {
  const { countdown } = useCountdown({
    finishTime: new Date(2022, 2, 11)
  });

  return (
    <span>{JSON.stringify(countdown)}</span>
  );
}

export default { App };

Invoke a function on finish

import React, { useRef } from 'react';
import { Text } from 'react-native';
import Confetti from 'react-native-confetti';
import { useCountdown } from '@kfiros/react-countdown-hook';

const App() {
  const confetti = useRef(null);
  const { countdown } = useCountdown({
    finishTime: new Date(2022, 2, 11),
    onFinish: () => confetti.startConfetti();
  });

  return (
    <Confetti ref={confetti}>
      <Text>{JSON.stringify(countdown)}</Text>
    </Confetti>
  );
}

export default { App };

Demo

About me

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License

Copyright (c) 2021 Kfir Nevo

This project is licensed under the terms of the MIT license. See the license file.